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Tensile strain and BaHfO3 doping modulating proton irradiation effects in REBCO coated conductors
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DOI：10.1088/1361-6668/ae5150.png)
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Abstract
En 中文
REBa2Cu3O7−δ (REBCO) coated conductors are promising candidates for compact fusion reactors, but their critical current density (Jc) is vulnerable to degradation under irradiation and mechanical strain. Proton irradiation experiments were conducted on undoped and BaHfO3 (BHO)-doped REBCO specimens at doses of 1.0 × 1014–3.0 × 1016 protons cm−2. A general degradation of Jc was observed, with the exception of a 5% enhancement in the undoped sample irradiated at 1.0 × 1014 protons cm−2 and measured at 30 K. Notably, applying tensile strain during irradiation (1.0 × 1016 protons cm−2) significantly accelerated Jc degradation, whereas BHO-doped conductors exhibited reduced Jc loss due to local compressive strain fields induced by BHO nanoparticles. Density functional theory calculations supported these results, showing that 1% tensile strain lowered the formation energy (Ef) of O(1) and O(4) vacancies by approximately 0.06 eV and 0.11 eV, respectively, thereby promoting oxygen vacancy formation. Transmission electron microscopy revealed increased defect densities in irradiated and strained conductors, consistent with the more pronounced degradation of Jc. These results demonstrated the strong interplay between strain and irradiation effects on REBCO coated conductors and highlight the effectiveness of BHO doping in mitigating Jc loss through local strain engineering. This provides practical guidance for designing REBCO conductors for extreme fusion reactor environments.
Keywords:
REBCO coated conductors
proton irradiation
tensile strain
BaHfO3 doping
critical current density
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